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<channel>
	<title>whaack</title>
	<atom:link href="http://ztkfg.com/feed/" rel="self" type="application/rss+xml" />
	<link>http://ztkfg.com</link>
	<description>198.211.113.164 // 6326 273B 61A7 00AF 4CD9 5A7B 8C6C AB19 24A6 4DEC</description>
	<pubDate>Thu, 24 Sep 2026 15:17:26 +0000</pubDate>
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	<language>en</language>
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			<item>
		<title>Restarting Bitcoind on My Centos 6.10 Desktop</title>
		<link>http://ztkfg.com/2026/09/restarting-bitcoind-on-my-centos-610-desktop/</link>
		<comments>http://ztkfg.com/2026/09/restarting-bitcoind-on-my-centos-610-desktop/#comments</comments>
		<pubDate>Thu, 24 Sep 2026 15:17:26 +0000</pubDate>
		<dc:creator>whaack</dc:creator>
		
		<category><![CDATA[Bitcoin]]></category>

		<category><![CDATA[Bitcoin Beginner]]></category>

		<guid isPermaLink="false">http://ztkfg.com/?p=560</guid>
		<description><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==Here are my notes regarding recovering an abandoned Bitcoin node on my desktop.
First, I tried to restart my bitcoind node. Upon running my local version of bitcoind, I hit this error. I’m still not sure what caused it. Before attempting to debug, I figured I should upgrade my bitcoind.1
I chose the only sane option available, [...]]]></description>
			<content:encoded><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==Here are my notes regarding recovering an abandoned Bitcoin node on my desktop.
First, I tried to restart my bitcoind node. Upon running my local version of bitcoind, I hit this error. I’m still not sure what caused it. Before attempting to debug, I figured I should upgrade my bitcoind.1
I chose the only sane option available, [...]]]></content:encoded>
			<wfw:commentRss>http://ztkfg.com/2026/09/restarting-bitcoind-on-my-centos-610-desktop/feed/</wfw:commentRss>
		</item>
		<item>
		<title>Barrels in Paradise</title>
		<link>http://ztkfg.com/2026/09/barrels-in-paradise/</link>
		<comments>http://ztkfg.com/2026/09/barrels-in-paradise/#comments</comments>
		<pubDate>Sat, 19 Sep 2026 00:44:17 +0000</pubDate>
		<dc:creator>whaack</dc:creator>
		
		<category><![CDATA[Surfing]]></category>

		<guid isPermaLink="false">http://ztkfg.com/?p=559</guid>
		<description><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==I’m still cheesing from my surf session this morning. I had so much fun that I stayed an extra hour and sun burn’d my back. So I better immortalize the memory of my surf session so I’ll have some good memories to look back to when I’m all wrinkly. 
I woke up at 4:55 am [...]]]></description>
			<content:encoded><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==I’m still cheesing from my surf session this morning. I had so much fun that I stayed an extra hour and sun burn’d my back. So I better immortalize the memory of my surf session so I’ll have some good memories to look back to when I’m all wrinkly. 
I woke up at 4:55 am [...]]]></content:encoded>
			<wfw:commentRss>http://ztkfg.com/2026/09/barrels-in-paradise/feed/</wfw:commentRss>
		</item>
		<item>
		<title>Why, with 2 cards missing, the odds of a 1-1 break are 52 percent instead of 50 percent.</title>
		<link>http://ztkfg.com/2026/04/why-with-2-cards-missing-the-odds-of-a-1-1-break-are-52-percent-instead-of-50-percent/</link>
		<comments>http://ztkfg.com/2026/04/why-with-2-cards-missing-the-odds-of-a-1-1-break-are-52-percent-instead-of-50-percent/#comments</comments>
		<pubDate>Mon, 06 Apr 2026 23:31:08 +0000</pubDate>
		<dc:creator>whaack</dc:creator>
		
		<category><![CDATA[Contract Bridge]]></category>

		<guid isPermaLink="false">http://ztkfg.com/?p=558</guid>
		<description><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==With 2 cards missing, let's say the K and the 2, it's easy to mislead oneself by drawing conclusions from the following table of all possibilities of the missing cards:


K
2


K2




K2


2
K


The erroneous conclusion is that an even split is equally likely to a king onside. The above table lists all the possible layouts of the suit [...]]]></description>
			<content:encoded><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==With 2 cards missing, let's say the K and the 2, it's easy to mislead oneself by drawing conclusions from the following table of all possibilities of the missing cards:


K
2


K2




K2


2
K


The erroneous conclusion is that an even split is equally likely to a king onside. The above table lists all the possible layouts of the suit [...]]]></content:encoded>
			<wfw:commentRss>http://ztkfg.com/2026/04/why-with-2-cards-missing-the-odds-of-a-1-1-break-are-52-percent-instead-of-50-percent/feed/</wfw:commentRss>
		</item>
		<item>
		<title>Notes on Groups and their Automorphism Group</title>
		<link>http://ztkfg.com/2026/03/notes-on-groups-and-their-automorphism-group/</link>
		<comments>http://ztkfg.com/2026/03/notes-on-groups-and-their-automorphism-group/#comments</comments>
		<pubDate>Thu, 26 Mar 2026 16:19:36 +0000</pubDate>
		<dc:creator>whaack</dc:creator>
		
		<category><![CDATA[Misc]]></category>

		<category><![CDATA[Reflection]]></category>

		<guid isPermaLink="false">http://ztkfg.com/?p=554</guid>
		<description><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==Every group1 has an intrinsic group, its automorphism2 group, which is the set of the group's automorphisms under function composition. At first, I thought the automorphism group was every permutation of the set of the elements in the original group. Let’s see why this is not so, and let's see what characteristics the automorphism group [...]]]></description>
			<content:encoded><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==Every group1 has an intrinsic group, its automorphism2 group, which is the set of the group's automorphisms under function composition. At first, I thought the automorphism group was every permutation of the set of the elements in the original group. Let’s see why this is not so, and let's see what characteristics the automorphism group [...]]]></content:encoded>
			<wfw:commentRss>http://ztkfg.com/2026/03/notes-on-groups-and-their-automorphism-group/feed/</wfw:commentRss>
		</item>
		<item>
		<title>Two times where I missed a trump promotion</title>
		<link>http://ztkfg.com/2026/01/two-times-where-i-missed-a-trump-promotion/</link>
		<comments>http://ztkfg.com/2026/01/two-times-where-i-missed-a-trump-promotion/#comments</comments>
		<pubDate>Sat, 24 Jan 2026 20:47:16 +0000</pubDate>
		<dc:creator>whaack</dc:creator>
		
		<category><![CDATA[Contract Bridge]]></category>

		<guid isPermaLink="false">http://ztkfg.com/?p=553</guid>
		<description><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==




will22&#9824;︎J8&#9829;︎7&#9830;︎107&#9827;︎4



MarciaJoy&#9824;︎&#8212;&#9829;︎&#8212;&#9830;︎J86&#9827;︎KQ7

nrollier&#9824;︎&#8212;&#9829;︎Q10&#9830;︎&#8212;&#9827;︎A1065



WillHaack&#9824;︎&#8212;&#9829;︎J8&#9830;︎Q&#9827;︎J98





On this hand clubs were trump and RHO was the declarer, and my partner led the J of spades, declarer pitching a heart. I failed to pitch the queen of diamonds. Since the dummy only had diamonds besides his high trumps after ruffing, he would have to give me a trump promotion when he played [...]]]></description>
			<content:encoded><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==




will22&#9824;︎J8&#9829;︎7&#9830;︎107&#9827;︎4



MarciaJoy&#9824;︎&#8212;&#9829;︎&#8212;&#9830;︎J86&#9827;︎KQ7

nrollier&#9824;︎&#8212;&#9829;︎Q10&#9830;︎&#8212;&#9827;︎A1065



WillHaack&#9824;︎&#8212;&#9829;︎J8&#9830;︎Q&#9827;︎J98





On this hand clubs were trump and RHO was the declarer, and my partner led the J of spades, declarer pitching a heart. I failed to pitch the queen of diamonds. Since the dummy only had diamonds besides his high trumps after ruffing, he would have to give me a trump promotion when he played [...]]]></content:encoded>
			<wfw:commentRss>http://ztkfg.com/2026/01/two-times-where-i-missed-a-trump-promotion/feed/</wfw:commentRss>
		</item>
		<item>
		<title>There's 2 pitches for the clubs!</title>
		<link>http://ztkfg.com/2026/01/theres-2-pitches-for-the-clubs/</link>
		<comments>http://ztkfg.com/2026/01/theres-2-pitches-for-the-clubs/#comments</comments>
		<pubDate>Fri, 23 Jan 2026 02:39:26 +0000</pubDate>
		<dc:creator>whaack</dc:creator>
		
		<category><![CDATA[Contract Bridge]]></category>

		<guid isPermaLink="false">http://ztkfg.com/?p=552</guid>
		<description><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==





18


will22&#9824;︎AJ543&#9829;︎Q10&#9830;︎Q854&#9827;︎Q9


BBO Viewer
Bridge Solver




ralanchase&#9824;︎762&#9829;︎J95&#9830;︎107&#9827;︎87432




W
N
E
S





P
1&#9829;︎
2&#9830;︎


P
2&#9824;︎
P
3&#9830;︎




rzinman133&#9824;︎Q1098&#9829;︎K8743&#9830;︎K&#9827;︎AK10



WillHaack&#9824;︎K&#9829;︎A62&#9830;︎AJ9632&#9827;︎J65

3&#9830;︎ S





Here's a hand that I played atrociously.
LHO lead a low heart. Naturally, I played him for the jack, and consequently caught the king. Now I played the king of spades, crossed to the dummy with a heart, and pitched a heart with the ace of spades. What a mistake! I was always [...]]]></description>
			<content:encoded><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==





18


will22&#9824;︎AJ543&#9829;︎Q10&#9830;︎Q854&#9827;︎Q9


BBO Viewer
Bridge Solver




ralanchase&#9824;︎762&#9829;︎J95&#9830;︎107&#9827;︎87432




W
N
E
S





P
1&#9829;︎
2&#9830;︎


P
2&#9824;︎
P
3&#9830;︎




rzinman133&#9824;︎Q1098&#9829;︎K8743&#9830;︎K&#9827;︎AK10



WillHaack&#9824;︎K&#9829;︎A62&#9830;︎AJ9632&#9827;︎J65

3&#9830;︎ S





Here's a hand that I played atrociously.
LHO lead a low heart. Naturally, I played him for the jack, and consequently caught the king. Now I played the king of spades, crossed to the dummy with a heart, and pitched a heart with the ace of spades. What a mistake! I was always [...]]]></content:encoded>
			<wfw:commentRss>http://ztkfg.com/2026/01/theres-2-pitches-for-the-clubs/feed/</wfw:commentRss>
		</item>
		<item>
		<title>bitcoindexplorer.com temporarily offline</title>
		<link>http://ztkfg.com/2026/01/bitcoindexplorercom-temporarily-offline/</link>
		<comments>http://ztkfg.com/2026/01/bitcoindexplorercom-temporarily-offline/#comments</comments>
		<pubDate>Wed, 21 Jan 2026 16:17:13 +0000</pubDate>
		<dc:creator>whaack</dc:creator>
		
		<category><![CDATA[Bitcoin]]></category>

		<guid isPermaLink="false">http://ztkfg.com/2026/01/bitcoindexplorercom-temporarily-offline/</guid>
		<description><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==Due to my tardiness in combating what seems to be a low-effort DoS against my public blockexplorer, bitcoindexplorer.com (aka explorer.ztkfg.com) is offline. You can still access it via the irc interface in jwrd's irc channel, see jfxpt.com. Someone seems to have rented an AWS box and used Claude AI with a prompt such as:
Generate and [...]]]></description>
			<content:encoded><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==Due to my tardiness in combating what seems to be a low-effort DoS against my public blockexplorer, bitcoindexplorer.com (aka explorer.ztkfg.com) is offline. You can still access it via the irc interface in jwrd's irc channel, see jfxpt.com. Someone seems to have rented an AWS box and used Claude AI with a prompt such as:
Generate and [...]]]></content:encoded>
			<wfw:commentRss>http://ztkfg.com/2026/01/bitcoindexplorercom-temporarily-offline/feed/</wfw:commentRss>
		</item>
		<item>
		<title>BridgeMaster Level 4 B-30, Stumbling on a Trump Squeeze</title>
		<link>http://ztkfg.com/2026/01/bridgemaster-level-4-b-30-stumbling-on-a-trump-squeeze/</link>
		<comments>http://ztkfg.com/2026/01/bridgemaster-level-4-b-30-stumbling-on-a-trump-squeeze/#comments</comments>
		<pubDate>Sat, 10 Jan 2026 01:47:37 +0000</pubDate>
		<dc:creator>whaack</dc:creator>
		
		<category><![CDATA[Contract Bridge]]></category>

		<guid isPermaLink="false">http://ztkfg.com/?p=548</guid>
		<description><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==




 

North&#9824;︎5432&#9829;︎432&#9830;︎AK4&#9827;︎QJ10


BBO Viewer
Bridge Solver




West&#9824;︎76&#9829;︎65&#9830;︎8765&#9827;︎AK432




W
N
E
S





2&#9824;︎
3&#9829;︎
P


4&#9829;︎







East&#9824;︎KQJ1098&#9829;︎87&#9830;︎Q109&#9827;︎65



WillHaack&#9824;︎A&#9829;︎AKQJ109&#9830;︎J32&#9827;︎987

4&#9829;︎ E





 Once again the bidding box is wrong, east dealt and bid 2S, south overcalled 3H, and north took south to game. 
West played 3 rounds of clubs, east ruffed the third round and returned a spade to declarer's ace. I drew trumps and on the second trump when east showed [...]]]></description>
			<content:encoded><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==




 

North&#9824;︎5432&#9829;︎432&#9830;︎AK4&#9827;︎QJ10


BBO Viewer
Bridge Solver




West&#9824;︎76&#9829;︎65&#9830;︎8765&#9827;︎AK432




W
N
E
S





2&#9824;︎
3&#9829;︎
P


4&#9829;︎







East&#9824;︎KQJ1098&#9829;︎87&#9830;︎Q109&#9827;︎65



WillHaack&#9824;︎A&#9829;︎AKQJ109&#9830;︎J32&#9827;︎987

4&#9829;︎ E





 Once again the bidding box is wrong, east dealt and bid 2S, south overcalled 3H, and north took south to game. 
West played 3 rounds of clubs, east ruffed the third round and returned a spade to declarer's ace. I drew trumps and on the second trump when east showed [...]]]></content:encoded>
			<wfw:commentRss>http://ztkfg.com/2026/01/bridgemaster-level-4-b-30-stumbling-on-a-trump-squeeze/feed/</wfw:commentRss>
		</item>
		<item>
		<title>bitcoindexplorer node report</title>
		<link>http://ztkfg.com/2026/01/bitcoindexplorer-updates/</link>
		<comments>http://ztkfg.com/2026/01/bitcoindexplorer-updates/#comments</comments>
		<pubDate>Thu, 08 Jan 2026 22:02:58 +0000</pubDate>
		<dc:creator>whaack</dc:creator>
		
		<category><![CDATA[Bitcoin]]></category>

		<guid isPermaLink="false">http://ztkfg.com/?p=549</guid>
		<description><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==bitcoindexplorer.com is down to 1 mirror and the bitcoin node that backs that mirror is far behind the tip of the chain. When I restart bitcoind, it starts to catch up at a decent rate, but then it chokes and gets stuck indefinitely after a couple of hours. I currently have a cronjob restarting bitcoind [...]]]></description>
			<content:encoded><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==bitcoindexplorer.com is down to 1 mirror and the bitcoin node that backs that mirror is far behind the tip of the chain. When I restart bitcoind, it starts to catch up at a decent rate, but then it chokes and gets stuck indefinitely after a couple of hours. I currently have a cronjob restarting bitcoind [...]]]></content:encoded>
			<wfw:commentRss>http://ztkfg.com/2026/01/bitcoindexplorer-updates/feed/</wfw:commentRss>
		</item>
		<item>
		<title>BridgeMaster Level 4 Deal B-29, The Vice</title>
		<link>http://ztkfg.com/2026/01/bridgemaster-level-4-deal-b-29/</link>
		<comments>http://ztkfg.com/2026/01/bridgemaster-level-4-deal-b-29/#comments</comments>
		<pubDate>Thu, 08 Jan 2026 15:26:04 +0000</pubDate>
		<dc:creator>whaack</dc:creator>
		
		<category><![CDATA[Contract Bridge]]></category>

		<guid isPermaLink="false">http://ztkfg.com/?p=547</guid>
		<description><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==




 

North&#9824;︎AK65&#9829;︎932&#9830;︎AKQJ&#9827;︎32


BBO Viewer
Bridge Solver




West&#9824;︎Q1098&#9829;︎J1087&#9830;︎6&#9827;︎7654




W
N
E
S





1NT
P
2&#9827;︎


P
2&#9830;︎
P
6NT




East&#9824;︎J7&#9829;︎A654&#9830;︎10987&#9827;︎1098



WillHaack&#9824;︎432&#9829;︎KQ&#9830;︎5432&#9827;︎AKQJ

6NT S





Once again the handviewer bidding is bugged, the contract is played by south. 
Let's go over how I got this problem wrong. 
West leads the jack of hearts which rides up to your king. Plan your play. 
I knew that the problem had something to do with a squeeze and squashing [...]]]></description>
			<content:encoded><![CDATA[MTUzNzEzMjQ2ODR8MjE2LjczLjIxNi44NQ==




 

North&#9824;︎AK65&#9829;︎932&#9830;︎AKQJ&#9827;︎32


BBO Viewer
Bridge Solver




West&#9824;︎Q1098&#9829;︎J1087&#9830;︎6&#9827;︎7654




W
N
E
S





1NT
P
2&#9827;︎


P
2&#9830;︎
P
6NT




East&#9824;︎J7&#9829;︎A654&#9830;︎10987&#9827;︎1098



WillHaack&#9824;︎432&#9829;︎KQ&#9830;︎5432&#9827;︎AKQJ

6NT S





Once again the handviewer bidding is bugged, the contract is played by south. 
Let's go over how I got this problem wrong. 
West leads the jack of hearts which rides up to your king. Plan your play. 
I knew that the problem had something to do with a squeeze and squashing [...]]]></content:encoded>
			<wfw:commentRss>http://ztkfg.com/2026/01/bridgemaster-level-4-deal-b-29/feed/</wfw:commentRss>
		</item>
	</channel>
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